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Thursday, July 26, 2012



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Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 19h 16m 18.61s[1]
Declination +46° 00′ 18.8″[1]
Apparent magnitude (V) 13.988
Spectral type G1IV

Proper motion (μ) RA: –0.39[1] mas/yr
Dec.: -14.96[1] mas/yr


Mass 1.164 [2] M
Radius 1.615 [2] R
Temperature 5849 [2] K
Metallicity [Fe/H] 0.12 [2] dex
Age 4.27 ± 0.87 [3] Gyr

Other designations
KOI-707, KIC 9458613, 2MASS 19161861+4600187[4]
Database references
Kepler-33 is a star in the constellation of Lyra with a system of five known planets. Having begun to evolve from the main sequence[3], it has roughly 161.5% of the Sun's radius but only 116.4% of the Sun's mass. Given its mass and temperature, it is likely an early G-type star. The star's distance is not known.

Planetary system

On January 26, 2012, a system of five planets around the star was announced[3]. However, unlike other planets confirmed via Kepler, their masses are not known, as Doppler Spectroscopy measurements were not done before announcement. Judging by their radii, b may be a large Super-Earth or small Hot Neptune while the other four are all likely to be the latter.
Planets b and c may actually be in a 7:3 resonance, as there is a 0.05 day discrepancy; there is also a small 0.18 day discrepancy between a 5:3 resonance between planets c and d. The other planets do not seem to be in any resonances, though near resonances are 3d:2e and 4e:3f.
The Kepler-33 system[3]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Radius
b 0.06544 5.667939 1.504 R
c 0.11484 13.17563 2.751 R
d 0.16053 21.7759 4.564 R
e 0.20656 31.78438 3.446 R
f 0.2449 41.02903 3.827 R

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